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How to multiply corresponding row values in a matrix with single row matrix in R?
To multiply row values in a matrix having multiple rows with single row matrix in R, we can follow the below steps −
First of all, create a matrix with multiple rows and a matrix with single row.
Then, use mapply function to multiply row values in those matrices.
Example
Create the first matrix
Let’s create a matrix as shown below −
M1<-matrix(rpois(100,10),ncol=4) M1
Output
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
[,1] [,2] [,3] [,4] [1,] 6 6 6 10 [2,] 12 8 6 13 [3,] 14 9 6 5 [4,] 10 8 15 7 [5,] 6 4 10 11 [6,] 9 11 10 10 [7,] 5 11 10 8 [8,] 11 14 9 13 [9,] 12 6 6 7 [10,] 6 10 12 11 [11,] 7 9 12 10 [12,] 16 13 11 11 [13,] 12 11 7 14 [14,] 14 11 8 9 [15,] 11 9 7 8 [16,] 9 12 17 7 [17,] 14 13 14 8 [18,] 9 15 11 9 [19,] 6 9 7 9 [20,] 17 8 11 7 [21,] 14 8 9 14 [22,] 9 15 11 10 [23,] 6 12 10 7 [24,] 11 9 12 15 [25,] 16 11 5 11
Create the second matrix
Let’s create a matrix as shown below −
M2<-matrix(c(1,0,2,5),nrow=1) M2
Output
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
[,1] [,2] [,3] [,4] [1,] 1 0 2 5
Multiply values from two matrices
Using mapply function to multiply row values in the matrix M1 having multiple rows with single row matrix M2 −
M1<-matrix(rpois(100,10),ncol=4) M2<-matrix(c(1,0,2,5),nrow=1) mapply(`*`,M1,M2)
Output
[1] 11 0 36 55 9 0 14 35 10 0 24 40 14 0 10 55 11 0 26 40 8 0 20 45 12 [26] 0 22 60 9 0 18 75 10 0 16 70 9 0 16 50 11 0 30 80 16 0 4 70 11 0 [51] 22 60 10 0 8 35 10 0 28 40 8 0 18 75 8 0 26 40 9 0 24 20 14 0 10 [76] 30 6 0 24 75 8 0 18 60 12 0 20 60 5 0 24 40 16 0 24 35 16 0 24 45
Updated on: 10-Nov-2021
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